Talks

12157 - 12168 of 19958 Results

Bootstrapping the O(N) Vector Models

David Simmons-Duffin Institute for Advanced Study (IAS)

October 15, 2013

PIRSA:13100074

High Energy Physics
Including astroparticle observables in global fits to new physics scenarios

Patrick Scott McGill University

October 15, 2013

PIRSA:13100103

High Energy Physics
Hybrid quantization of the Gowdy model within loop quantum cosmology

Mercedes Martin-Benito Complutense University of Madrid

October 15, 2013

PIRSA:13100102

Astrophysics
13/14 PSI - Statistical Mechanics - Lecture 6

Anton Burkov University of Waterloo

October 15, 2013

PIRSA:13100050
13/14 PSI - Quantum Field Theory I - Lecture 5

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 11, 2013

PIRSA:13100024
13/14 PSI - Statistical Mechanics - Lecture 5

Anton Burkov University of Waterloo

October 11, 2013

PIRSA:13100043
General Relativity for Cosmology - Lecture 6

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100104
General Relativity for Cosmology - Lecture 5

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100007
Fractional solitons on the edge of the Fractional Quantum Hall states

Paul Wiegmann University of Chicago - James Franck Institute

October 10, 2013

PIRSA:13100073

Condensed Matter
13/14 PSI - Quantum Field Theory I - Lecture 4

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 10, 2013

PIRSA:13100023
Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Aron Wall University of Cambridge

October 10, 2013

PIRSA:13100066

General Relativity & Quantum Cosmology
Plasma without Plasma: Exploring Force-Free Magnetospheres

Sam Gralla University of Arizona

October 10, 2013

PIRSA:13100078

General Relativity & Quantum Cosmology

Bootstrapping the O(N) Vector Models

David Simmons-Duffin Institute for Advanced Study (IAS)

October 15, 2013

PIRSA:13100074

High Energy Physics

We study the conformal bootstrap for 3D CFTs with O(N) global symmetry. We obtain rigorous upper bounds on the scaling dimensions of the first O(N) singlet and symmetric tensor operators appearing in the \phi_i x \phi_j OPE, where \phi_i is a fundamental of O(N). Comparing these bounds to previous determinations of critical exponents in the O(N) vector models, we find strong numerical evidence that the O(N) vector models saturate the bootstrap constraints at all values of N. We also compute general lower bounds on the central charge, giving numerical predictions for the values realized in the O(N) vector models. We compare our predictions to previous computations in the 1/N expansion, finding precise agreement at large values of N.
Including astroparticle observables in global fits to new physics scenarios

Patrick Scott McGill University

October 15, 2013

PIRSA:13100103

High Energy Physics

Searches for physics beyond the standard model come in many forms, from terrestrial probes to astroparticle experiments and cosmological observations. Efforts to combine multiple search channels in 'global fits' to new physics scenarios typically consider only a subset of the available channels. Astroparticle searches in particular are usually only included in a very approximate way, if at all. In this talk I will review recent progress in including detailed gamma-ray, neutrino and CMB searches for dark matter in global fits. I will also preview some of the future developments and challenges in this field, where the applicability of global fits will move well beyond the small range of constrained supersymmetric models they have so far mostly been applied to.
Hybrid quantization of the Gowdy model within loop quantum cosmology

Mercedes Martin-Benito Complutense University of Madrid

October 15, 2013

PIRSA:13100102

Astrophysics

Loop quantum cosmology (LQC) proposes a quantization for homogeneous cosmologies which success in solving the classical singularity problem. Realistic scenarios call for the consideration of inhomogeneities. Focusing on the simplest inhomogenous cosmological model, the Gowdy model with three-torus spatial topology and linearly polarized gravitational waves, I'll describe an approach to treat inhomogeneities in the framework of loop quantum cosmology. This is a hybrid approach that combines LQC methods with Fock quantization. Furthermore, I'll discuss justified approximations that allow us to find approximate solutions to the (very complicated) Hamiltonian constraint of the model.
13/14 PSI - Statistical Mechanics - Lecture 6

Anton Burkov University of Waterloo

October 15, 2013

PIRSA:13100050
13/14 PSI - Quantum Field Theory I - Lecture 5

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 11, 2013

PIRSA:13100024
13/14 PSI - Statistical Mechanics - Lecture 5

Anton Burkov University of Waterloo

October 11, 2013

PIRSA:13100043
General Relativity for Cosmology - Lecture 6

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100104
General Relativity for Cosmology - Lecture 5

Achim Kempf University of Waterloo

October 10, 2013

PIRSA:13100007
Fractional solitons on the edge of the Fractional Quantum Hall states

Paul Wiegmann University of Chicago - James Franck Institute

October 10, 2013

PIRSA:13100073

Condensed Matter

We argue that dynamics of gapless Fractional Quantum Hall Edge states is essentially non-linear and that it features fractionally quantized solitons propagating along the edge. Observation of solitons would be a direct evidence of fractional charges. We show that the non-linear dynamics of the Laughlin's FQH state is governed by the quantum Benjamin-Ono equation.
13/14 PSI - Quantum Field Theory I - Lecture 4

Freddy Cachazo Perimeter Institute for Theoretical Physics

October 10, 2013

PIRSA:13100023
Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Aron Wall University of Cambridge

October 10, 2013

PIRSA:13100066

General Relativity & Quantum Cosmology

AdS/CFT is a duality relating the degrees of freedom in a D dimensional bulk gravity theory to a (D-1) dimensional theory living on the boundary. I will argue that in fact the boundary theory contains only a subset of the bulk observables. For each state of the boundary theory, there are multiple bulk states dual to it, which can be operationally distinguished by observers who fall across event horizons. Based on arXiv:1210.3590.
Plasma without Plasma: Exploring Force-Free Magnetospheres

Sam Gralla University of Arizona

October 10, 2013

PIRSA:13100078

General Relativity & Quantum Cosmology

Pulsars have enormous magnetic fields whose energy density dwarfs the rest mass density of their plasma magnetosphere. In this regime of a plasma, the particles drop out of the description, leaving a set of equations for the electromagnetic field alone. This non-linear, deterministic system is known as force-free electrodynamics, and turns out to have some beautiful and bizarre features. I will give a pedagogical introduction to these equations and their role in astrophysics and then discuss our recent contributions. We have taken a geometric viewpoint, using the null structure of spacetime to unify previous exact solutions and discover new ones. We have found non-stationary, non-axisymmetric solutions that describe the outer magnetosphere of pulsars, including those that are accelerated or torqued. We have derived the standard cartoon of the aligned pulsar magnetosphere from an explicit, minimal set of assumptions. Time permitting, I will also discuss some properties of black hole magnetospheres: Blandford-Znajek energy extraction, non-scattering force-free waves, and the no-ingrown-hair theorem.

Title	Date	Collection	Type	Info
Bootstrapping the O(N) Vector Models	2013‑10‑15	Quantum Fields and Strings	Scientific Series	View details
Including astroparticle observables in global fits to new physics scenarios	2013‑10‑15	Particle Physics	Scientific Series	View details
Hybrid quantization of the Gowdy model within loop quantum cosmology	2013‑10‑15	Cosmology and Gravitation	Scientific Series	View details
13/14 PSI - Statistical Mechanics - Lecture 6	2013‑10‑15	13/14 PSI - Statistical Mechanics	Course	View details
13/14 PSI - Quantum Field Theory I - Lecture 5	2013‑10‑11	13/14 PSI - Quantum Field Theory I	Course	View details
13/14 PSI - Statistical Mechanics - Lecture 5	2013‑10‑11	13/14 PSI - Statistical Mechanics	Course	View details
General Relativity for Cosmology - Lecture 6	2013‑10‑10	General Relativity for Cosmology - 2013	Course	View details
General Relativity for Cosmology - Lecture 5	2013‑10‑10	General Relativity for Cosmology - 2013	Course	View details
Fractional solitons on the edge of the Fractional Quantum Hall states	2013‑10‑10	Quantum Matter	Scientific Series	View details
13/14 PSI - Quantum Field Theory I - Lecture 4	2013‑10‑10	13/14 PSI - Quantum Field Theory I	Course	View details
Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar	2013‑10‑10	Quantum Gravity	Scientific Series	View details
Plasma without Plasma: Exploring Force-Free Magnetospheres	2013‑10‑10	Strong Gravity	Scientific Series	View details

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Format results

Bootstrapping the O(N) Vector Models

Including astroparticle observables in global fits to new physics scenarios

Hybrid quantization of the Gowdy model within loop quantum cosmology

13/14 PSI - Statistical Mechanics - Lecture 6

13/14 PSI - Quantum Field Theory I - Lecture 5

13/14 PSI - Statistical Mechanics - Lecture 5

General Relativity for Cosmology - Lecture 6

General Relativity for Cosmology - Lecture 5

Fractional solitons on the edge of the Fractional Quantum Hall states

13/14 PSI - Quantum Field Theory I - Lecture 4

Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Plasma without Plasma: Exploring Force-Free Magnetospheres

Bootstrapping the O(N) Vector Models

Including astroparticle observables in global fits to new physics scenarios

Hybrid quantization of the Gowdy model within loop quantum cosmology

13/14 PSI - Statistical Mechanics - Lecture 6

13/14 PSI - Quantum Field Theory I - Lecture 5

13/14 PSI - Statistical Mechanics - Lecture 5

General Relativity for Cosmology - Lecture 6

General Relativity for Cosmology - Lecture 5

Fractional solitons on the edge of the Fractional Quantum Hall states

13/14 PSI - Quantum Field Theory I - Lecture 4

Superselection Sectors in AdS/CFT - Joint Quantum Gravity and String Theory Seminar

Plasma without Plasma: Exploring Force-Free Magnetospheres